It’s been a long strange trip to this post, across many years and many little personal projects. Let’s start here to de-tangle some of it.

Back in the late 2010s (2018 or so) I started purchasing Adafruit boards which included Circuit Playground as well as several Feather boards. They all came preloaded with CircuitPython, Adafruit’s fork of MicroPython. The boards were easy to program with embedded Python and the tools, while simple, were solid. What I appreciated most (and still do) is how the boards, when plugged into a host computer via USB, appear as a drive on the host system. You can then edit CircuitPython code directly on the device, and if it’s running when you save a new version, the device will note the file system change and restart with the version of your code you just saved. You can use any editor on the host system you desire and are already familiar with. The only other tool needed on the host system for development is a serial application that can work with the Adafruit device’s USB serial port. With that application you have a full Python REPL to work with, and when the application is running, you can see any printed outputs or see when and where you have a CircuitPython coding error.

The last time I worked with those boards was back in 2019, before I retired and before the Pandemic and Lockdown took hold. They went into my gadget storage and stayed there until earlier this week. I was looking for another device that had Bluetooth capabilities, so of course when I unearthed the Bluefruit in my stash I pulled it out and plugged it in. It started up just fine, except the Bluetooth code section I’d written did nothing. I opened the boot_out.txt file on the device’s flash device and read it was still running with CircuitPython 7.2. The current CircuitPython release is 8.2.9, a rather wide difference between versions. So I decided I’d stop and upgrade the device’s CircuitPython.

When you arrive at the CircuitPython download page ( https://circuitpython.org/board/circuitplayground_bluefruit/ ) for the Bluefruit you’re presented with a very clear warning about the device’s bootloader. Since I knew without looking that my copy of Bluefruit would need a bootloader update, I scrolled down to the part at the very bottom that spoke of how to update the bootloader.

At this section things begin to get a little murky. There’s a cautionary note to start off about how to find out what bootloader version you have and not to update unless you have to (I knew I had to) and then two links off the page, one to generic instructions and a big button to browse the bootloader repo. I’ll cut to the chase.

Follow this link and the resulting instructions: https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/update-bootloader-use-command-line#

Long story short, after several failed attempts following directions before the command line instructions, I managed to update the bootloader and then update my Bluefruit to CircuitPython 8.2.9. I did all of this under Linux Mint, and it went swimmingly. When it powered back up the Bluetooth section failed to run with a coding error, so I disabled the one call to that module with a single comment and let the rest of it execute. I’ve now got two boards I need to investigate Bluetooth functionality. But, hey, it’s just a hobby, right?